Abstract
The effects of Hg, As, Pb, Cu, Cd, and Cr (1, 2, and 5 mg L−1 each) on Azolla pinnata R. Br. were analyzed. The treatments (2 and 5 mg L−1) of the heavy metal pollutants decreased Hill activity, chlorophyll, protein and dry wt, and increased tissue permeability over control values. The effects were most pronounced with the treatment of 5 mg L−1. The harmful effects of the metals were, in general, found by the treatments in the order: Cd 〉 Hg 〉 Cu 〉 As 〉 Pb 〉 Cr. There was no significant change in these parameters at 1 mg L−1 of the metals over control. Thus Azolla pinnata shows tolerance to the heavy metals tested up to 1 mg L−1 each.
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Sarkar, A., Jana, S. Heavy metal pollutant tolerance of Azolla Pinnata . Water Air Soil Pollut 27, 15–18 (1986). https://doi.org/10.1007/BF00464765
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DOI: https://doi.org/10.1007/BF00464765